You can't make this up.
I'm pretty sure the city's water department does this every year.
Iwaki City in Fukushima Prefecture says it has selected a drawing by a 4th grader for its "Tap Water Week" campaign. It has been made into postcards to be distributed at the city's public facilities (municipal government branches, public libraries, community halls) and tourist and cultural facilities. They will be given to all elementary school children in Iwaki City.
At the top of the card, it says:
From Water Department of Iwaki City: "Let's Drink Tap Water!"
In recent years, mineral water in PET bottles have been popular. But tap water is gentle on the environment, safe and secure, and delicious water. Water in Iwaki, blessed with nature. Water that you can enjoy right from the tap. Let's drink in big gulps!
All the kanji (Chinese characters) on the postcard have "furigana" (kana, or phonetic Japanese characters over kanji to indicate pronunciation) so that even the 1st graders can read.
(Elementary school children reading the card to their parents at home. I could almost see it now.)
Iwaki City still does the testing of drinking water for radioactive cesium, and it has been ND (not detected). The detection limit is 1 bq/kg.
(I am so sick of the phrase now - "safe and secure" or 安心・安全.)